Solutions for structural features such as sheet metal and fasteners for automobile bodies

The structural characteristics of the automobile body are generally composed of an outer cover, an inner cover, and skeleton parts. The sheet metal fastener thickness is generally 0.8 ~ 1.2mm; some models of the outer cover sheet metal thickness of only 0.6mm, with 0.7mm, the skeleton parts of the sheet metal thickness of 1.2 ~ 2.5mm, that is to say, most of them for the thin plate parts. For welding fixture design, the following characteristics should be considered:

一、Poor rigidity, easy to deform

After molding, sheet stamping parts have a certain degree of rigidity. Still, compared with machined parts, the rigidity is much worse, and single large stamping parts are easily deformed only after welding into the body shell, only with solid rigidity. Sedan body large side enclosure plate, for example, the general material thickness of 0.7 ~ 0.8mm, the vast majority of 0.8mm, stretching the formation of the cavity, the rigidity is feeble when welded to form the side enclosure and the inner plate pieces welded to form the side enclosure welded assembly only after a muscular rigidity. The main feature of the body is sheet metal.

1. High strength: sheet metal structural components of high-strength steel materials, high tensile strength, and compressive strength.

2. Lightweight: sheet metal structural parts are light in weight, with a density of only 30-50% of that of ordinary steel structures, which can significantly reduce the weight of buildings.

3. Aesthetically pleasing: Sheet metal structural components have a smooth and beautiful appearance that can be used directly as a decorative structure of the building or easily coated.

4. Standardization: Sheet metal structural parts can be industrially produced, and the profiles can be standardized for easy installation and connection.

5. Good fire resistance: Some sheet metal materials and coatings have good flame retardant properties, which meet the fire resistance requirements.

6. Good weather resistance: Hot-dip galvanizing and other treatments, which have strong corrosion and weather resistance and long service life, are used.

7. Simple construction: Sheet metal structural parts are elementary to process, transport, and install compared with general steel structural parts, and the construction cycle is short.

8. High overall price ratio: sheet metal structural components have lower production costs but higher strength and performance, with good economic benefits.

二、Complex structure and shape

An automobile body is made of thin plate stamping parts welded into the space shell to shape beautifully and make the shell have a certain degree of rigidity composed of the body parts, usually after the space curved surface body stretching molding, and the shape structure is more complex. Especially with the development of modern automobile technology and consumer demand for automobile quality and fashionable appearance is getting higher and higher, the body structure design is also getting more and more complicated and needs to use a series of metal panel fastening：self-clinching nut installation， self-clinching nut hand tool， self-clinching nut， blind threaded rivet nuts， blind nut riveter kit， flat head blind rivet nut， blind rivet nut m6， blind rivet nut setting tool， self-tapping screws， Press-Fit Threaded Standoffs with Closed End.

The main application areas of sheet metal structural components：

1. Construction: It is used as load-bearing structural parts for roofs and walls of large-span buildings such as factories, warehouses, and gymnasiums.

2. Machinery Manufacturing: Used in the base, bracket, and outer frame of robots, machine tools, and other mechanical equipment.

3. Electronic and electrical appliances: used for production line racks, integrated circuit board racks, transformer covers, and other components.

4. Rail transportation: used in the internal structure of high-speed railroad and subway carriages to reduce the weight of the car body and increase the passenger capacity.

5. Aerospace: used for carrier rockets, space planes, and other structural components and shells, requiring high strength and lightweight.

6. Decorative industry: The requirements are beautiful and corrosion-resistant. As a building inside and outside, the decorative use of support structures, screens, and other components requires that it be used for office furniture and storage shelves, etc., requiring high strength, beautiful appearance, and corrosion resistance.

三、Dimensioning in spatial three-dimensional coordinates

Automotive body product drawings in three-dimensional spatial coordinates to labeling dimensions. To indicate the position of the cover in the car and to mark the size of the car body is generally every 200mm or 400mm to draw a coordinate grid line, and the car coordinate system varies; here is an example of the car, the general definition of the car coordinate system coordinate origin is:

X-axis: the symmetry plane of the body and the main floor of the lower plane of the intersection between the line to the rear of the body for an upbeat and downbeat front.

Y-axis: the center of the front wheels and perpendicular to the plane of the body under the plane of the floor and the body of the plane of symmetry of the intersection between the line, to the right side of the body, is positive, the left side of the body is harmful.

Z-axis: a line through the center of the two front wheels and perpendicular to the central floor plane; upward is positive, downward is negative.

Main connection methods for sheet metal structural parts of automobile body：

1. Fastening connection: using high-strength fasteners such as chains, bolts, etc. to connect different parts. It is simple and easy, but the structural stability is poor. Bolts, studs, screws, nuts, self-tapping screws, wood screws, washers, retaining rings, pins, rivets, combinations and connecting parts， Mil. Spec. Alloy Steel Socket Head Screws, Serrated-Flange Socket Head Screws, Alloy Steel Low-Profile Socket Head Screws, Vibration-Resistant Sealing Socket Head Screws, Alloy Steel 12-Point Screws, Super-Corrosion-Resistant 316 Stainless Steel Phillips Rounded Head Screws for Sheet Metal, Steel Phillips Rounded Head Screws for Sheet Metal, Strip-Resistant Screws for Sheet Metal.Steel Hex Head Thread-Cutting Screws for Metal, Low-Strength Grade A Steel Square Head Screws, High-Strength Grade 8 Steel Hex Head Screws.

2. Welding connection: use arc welding, gas welding, and other ways to weld different parts. The connection is firm, but the welding quality needs to be strictly controlled. Steel Hex Weld Nuts, Stainless Steel Hex Weld Nuts, Metric Stainless Steel Hex Weld Nuts, Square Weld Nuts, Low-Profile Narrow-Base Weld Nuts, Stainless Steel Offset-Barrel Narrow-Base Weld Nuts, Metric Steel Narrow-Base Weld Nuts.

3. Splice connection: fast splicing is realized through the sockets and slots of the components, then fixed by fasteners or welded joints. Easy to connect but relatively low strength.Steel Narrow-Base Weld Nuts, Stainless Steel Narrow-Base Weld Nuts, Steel Round-Base Weld Nuts, Stainless Steel Round-Base Weld Nuts, Surface-Mount Weld-On Pins, Spot weld these pins directly to a surface for greater rigidity and strength than other pins—no mounting hole required, Through-Hole Weld-On Pins, Weld-On Stud Anchors for Wet Concrete.

4. Adhesive connection: Use high-strength structural adhesive to connect different parts by adhesive. The connection has a long service life, but the requirements for surface treatment are high, and the construction environment is limited.

Sheet metal structural parts refer to the structural parts made of various sheet metal plates produced by cold or hot working processes, including sheet metal beams, columns, trusses, cabinet frames, supports, etc., which are widely used in construction, decoration, machinery, electronics, and other industries.

If you are looking for high-quality automotive fastener screws & all kinds of plastic fasteners or technical support for structural design, please get in touch with me. Use our new Product Finder tool, download our Product Catalog, and let us help you get custom parts.adelajonly@gmail.com. Thanks. Website: www.juxinfasteners.com